JPH07254445A - Connector - Google Patents

Abstract

PURPOSE:To enable use in a high temperature environment by eliminating an electrode terminal from being shaven by strong sliding contact with a contact material or a surface from being roughened when the inserting member side electrode terminal is inserted, and obtaining high connecting stability of the contact material and an inserting member in an electric connector. CONSTITUTION:A nut 14 and a contact material 13 which is composed of a conductive material and has a spring structure are installed in a housing body 12 composed of an insulating material, and after they are installed, a cover housing 15 composed of an insulating material separate from the housing body is installed in a part of the housing body in which the nut and the contact material are inserted. After an inserting member is inserted in the contact material, the contact material is fastened by a screw and a nut, and the contact material and the inserting member are connected to each other. A projecting part 15a to hold at least one surface of a side surface of the nut inserted in the housing body is arranged on the cover housing 15 installed on the housing body.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrically connected connector.

[0002]

2. Description of the Related Art Conventionally, connectors having various shapes have been devised for the purpose of electrically connecting different parts.

A general connector comprises a contact material having a spring property by forming a plate material made of a conductive metal into a desired shape, and a housing for holding the contact material and insulating it from the surroundings. Then, by inserting an insertion member to be electrically connected to this connector against the spring property of the contact material on the connector side, the contact material on the connector side and the electrode terminal (electrode portion) on the insertion member side are inserted. They are brought into pressure contact with each other to make electrical contact.

That is, when the insertion member is inserted into the connector, the contact material on the connector side is elastically deformed from the released state (free state) with a certain displacement amount, and the load (reaction force) due to the elastic deformation is applied to the electrode of the insertion member. By contacting the terminal, the contact material on the connector side and the electrode portion on the insertion member side are brought into pressure contact with each other to be electrically connected.

The performance required for the contact material of the connector includes electrical conductivity, conductivity, contact performance (wear and electrochemical corrosivity), and mechanical performance such as spring property, spring constant, and stress relaxation. There are rates, etc.

The performance required for the housing of the connector includes electrical properties such as insulation and withstand voltage, and mechanical properties such as dimensional stability (heat deformation / softening) and strength (cracking).

As the insertion member to be inserted and connected to the connector, there are the same connector having an electrode at a portion corresponding to the position of the contact material of the connector, an IC, a circuit board, a flexible board, a ceramic board, a glass board and the like. is there. Further, there is a case where these substrates and a member holding the substrates are simultaneously inserted.

A specific example of such a connector and connection structure will be described below with reference to FIGS. In this example, in an image forming apparatus such as a copying machine or a laser beam printer, a film heating type heating apparatus for heating and fixing an unfixed toner image formed and carried on a recording medium (Japanese Patent Laid-Open No. 63-313182). JP-A 1-263679 / JP-A-2-157878 / JP-A-4-44
No. 075-44083, etc.) for supplying power to the heating means.

In the film heating type heating device, a heat-resistant film is sandwiched between the heating means and the facing means to run, and the heat-resistant film in the nip portion formed by the heating means and the facing means with the heat-resistant film sandwiched therebetween. The recording medium on which the unfixed toner image is formed and supported is introduced between the heat-resistant film and the facing means, and the heat-resistant film is brought into close contact with the heat-resistant film and passed through the nip portion together with the heat-resistant film to transfer the heat of the heating means It is applied to a recording medium to heat and fix an unfixed toner image on the recording medium.

Such a film heating type heating device can use a heating means having a low heat capacity and a thin heat-resistant film that can quickly raise the temperature, so that power saving and reduction of wait time (quick start property) can be achieved. It will be possible. This is effective because it has the advantage of being able to lower the temperature rise inside the main body of the image forming apparatus or the like.

The heating means is basically composed of a heat-resistant and insulating ceramic substrate and an electric heating element (electric heating resistor) formed on the substrate, and electric power is supplied to the electric heating element to generate heat. A so-called linear ceramic heater is used.

FIG. 21 shows the film heating type heating device A.
Fig. 22 is a cross-sectional model view of the main part of Fig. 22, Fig. 22 is a plan view of a heater with a power supply connector fitted to both ends, with some cutouts and intermediate portions omitted, and an energization circuit diagram. Fig. 23 is a heater with a power supply connector fitted. 24 is a perspective view of both ends, and FIG. 24 is a vertical cross-sectional side view of one of the power supply connector portions.

1 is a heater, a. An elongated substrate 2 having electrical insulation, heat resistance, and low heat capacity; b. An electric heating element 3 formed in a linear strip shape along the longitudinal direction of the substrate at the central portion in the substrate width direction on the one surface side (front surface side) of the substrate 2, c. Electrode terminals (connection terminals, electrode portions) 4 and 4 formed on the surface of the substrate by electrically connecting both ends of the electric heating element 3
And d. An electrically insulating overcoat layer 5 of glass or the like as a heater surface protection layer covering the surface of the substrate 2 on which the electric heating element is formed, e. It is composed of a temperature detecting element 6 such as a thermistor provided on the other surface side (back surface side) of the substrate 2.

The substrate 2 has a width of 10 mm and a thickness of 1 mm, for example.
A ceramic plate such as Al ₂ O ₃ , AlN, or SiC having a length of 240 mm.

The electric heating element 3 is, for example, a pattern layer having a thickness of 10 μm and a width of 1 mm, which is formed by baking Ag / Pd (silver-palladium alloy), RuO ₂ , Ta ₂ N or the like coated by screen printing in the atmosphere. Is.

The electrode terminals 4 and 4 usually have a thickness of 10 μm,
It is a pattern layer formed by baking Ag coated by screen printing or the like in the atmosphere.

The overcoat layer 5 side of the heater 1 is a film contact sliding surface, and this surface side is exposed to the outside so that the heater 1 is fixedly supported by a heater supporting member 8 via a heat insulating heater holder 7.

Reference numeral 9 denotes an endless belt-shaped or long web-shaped heat-resistant film of polyimide or the like having a thickness of, for example, about 40 μm, and 10 denotes a pressure roller as a pressure member for pressing the film 9 against the heater 1. .

The film 9 is rotated or run while sliding on the heater 1 surface in a state in which the film 9 is in close contact with the heater 1 surface in a direction indicated by an arrow at a predetermined speed by a driving member (not shown) or a rotational force of the pressure roller 10. Moving.

The heater 1 and the heater holder 7 to which the heater 1 is attached have power supply connectors 50, 50 fitted to both ends thereof, and both end electrode terminals 4 of the energization heating element 3 of the heater 1.
4, the contact members 51, 51 of the power supply connector 50, 50 are pressed against each other, and an AC voltage is applied from the power source S between the electrode terminals 4, 4 via the power supply connector 50, 50, and the energization heating element 3 generates heat. By doing so, the temperature is raised.

The temperature of the heater 1 is detected by the temperature detecting element 6 on the back surface of the substrate, and the detected information is fed back to the energization control circuit C to control the energization of the energization heating element 3 from the power source S, whereby the heater 1 is operated. The temperature is controlled to a predetermined temperature.

The temperature detecting element 6 of the heater 1 is a fixing surface having the best thermal responsiveness, that is, a substrate rear surface partial position (corresponding to a position directly below the electric heating element 3) corresponding to a formation position of the electric heating element 3 on the heater substrate front surface side. It is disposed on the rear surface side of the substrate).

In order to control and control the temperature of the fixing surface, the heater 1 has an electric heating element 3 positioned in the center of the width region of the fixing nip portion N (pressure contact nip portion, pressure portion) in the cross section of the apparatus. There is.

When the heater 1 is heated to a predetermined temperature by energizing the energization heating element 3 of the heater 1, and the film 9 is driven to move, the film 9 and the pressure roller 1 are moved.
By introducing the recording medium P into the fixing nip portion N, which is a pressure contact portion with 0, with the unfixed toner image surface on the film 9 side, the recording medium P adheres to the film 9 surface and the fixing nip portion together with the film 9. The recording medium P is moved and passed through N, and heat energy is applied to the recording medium P from the heater 1 through the film 9 during the movement and the unfixed toner image t
Is melted and fixed by heating.

As shown in FIGS. 22 and 24, the power supply connectors 50 and 50 are made of a conductive metal plate material (spring material electrode,
In general, the contact material 51, 51 is made by bending a phosphor bronze) to have a spring property, and the housing 52, 52 for holding the contact material 51, 51 and insulating it from the surroundings. Power supply wire W for contact material 51
W is caulked and connected.

The power supply connectors 50, 50 are fitted on both ends of the heater 1 and the heater holder 7 to which the heater 1 is attached by using the both ends as insertion members.

In the power feeding connector 50/50 of this example, the contact members 51/51 have a spring property due to the cantilever structure, and the ends of the heater 1 and the heater holder 7 as the insertion member are inserted into the connector 50/50.・ Displacement amount ε of the contact material 51, 51 that occurs when mated
And the contact material 51.51 is pressed against the electrode terminals 4.4 of the heater 1 by the load value F = K × ε with the spring constant K due to the cantilever structure, and the contact material 51.51 on the connector 50.50 side. And the electrode terminals 4, 4 on the heater end side, which is an insertion member, are electrically connected.

[0028]

[Problems to be Solved by the Invention] As a connector,
A stable connection cannot be obtained unless the insertion member is inserted and the load value F is maintained in the fitted state.

However, in terms of materials, when a contact material generates a load due to displacement for a long period of time, creep causes plastic deformation and the displacement amount decreases (ε → ε ′, ε ′).
<Ε). Therefore, the load value decreases (F ′ = K × ε ′,
F '<F), and in the worst case, the load value applied to the electrode terminal becomes zero, and the electrical release state occurs. Such a creep phenomenon remarkably appears especially when the environmental temperature is high.

Therefore, it is required to design the shape of the contact material in consideration of the decrease in load due to creep under the operating environment conditions. Therefore, the initial load value becomes high.

In the heating device A of the above-described example, the amount of heat generated by the heater 1 must be increased in order to increase the fixing speed, and the energizing current must be increased for that purpose.

The connectors 50, 50 used for supplying power to the heater 1 of such a heating device include the heat generation of the electric heating element 3 and the contact members 51, 51 of the connectors 50, 50.
It will be used in an extremely high temperature environment due to heat generated during energization due to the conduction resistance of the electrode terminals 4 and 4. Therefore, the contact materials 51, 51 undergo plastic deformation due to thermal creep, the connection load decreases, the contact pressure decreases, and in the worst case, the contact materials 51.5 of the connector 50, 50.
1 and the electrode terminals 4 and 4 are electrically opened.

Therefore, it is necessary for the connectors 50, 50 to be designed in consideration of a contact pressure drop due to creep in a high temperature environment. However, for that purpose, it is necessary to increase the spring constant of the contact members 51, 51 or increase the displacement amount of the contact members 51, 51 when the insertion member is inserted. The method of increasing the spring constant of the contact members 51, 51 is not preferable from the stability of the connection because the variation of the thickness of the insertion member causes the variation of the connection load value. The method of increasing the displacement amount of the contact members 51, 51 is not preferable because a large insertion force is required when inserting the insertion member and the electrode terminals 4, 4 are scraped off when the insertion member is inserted.

Therefore, according to the present invention, the insertion member can be inserted with a low insertion force so that the electrode terminal on the insertion member side is not scraped by a strong rubbing against the contact material at the time of insertion or the surface of the electrode terminal is not roughened. In addition, when connecting the contact material and the insertion member, a high load value for the insertion member is obtained from the contact material to obtain high connection stability, enabling use in a higher temperature environment, and as an image fixing device. In the above heating device, it is an object to stably supply a larger current to the heating heater, thereby making it possible to increase the fixing speed and the fixing size.

[0035]

The present invention is a connector characterized by the following constitutions.

(1) A nut and a contact material made of a conductive material and having a spring structure are mounted on a housing body made of an insulating material. After mounting, the housing is provided at a part of the housing body where the nut and the contact material are inserted. It has a structure with a cover housing made of an insulating material separate from the body, and after inserting the insertion member into the contact material,
A connector having a structure for connecting the contact material and the insertion member by tightening the contact material with a screw and the nut, and at least one side surface of a nut inserted into the housing body in a cover housing attached to the body housing. A connector that is provided with a protrusion that holds the connector.

(2) The connector according to (1), wherein the nut is a hexagonal nut.

(3) A nut and a contact material made of a conductive material and having a spring structure are mounted on a housing body made of an insulating material, and after inserting the insertion member into the contact material, the contact material is screwed and the nut is used. A connector having a structure in which a contact member and an insertion member are connected by tightening the connector, and the nut inserted into the housing is a quadrangular shape.

(4) A cover housing made of an insulating material separate from the housing body is attached to a part of the housing body in which the nut and the contact material are inserted, and the cover housing is inserted into the housing body. The connector according to (3), wherein a protrusion that holds the rear end of the quadrangular nut is provided.

[0040]

[Operation] After the insertion member is inserted into the contact member, the contact member is tightened with the screw and the nut so that the insertion member and the contact member are connected to each other. Since it is not tightened and it is in the released state, the insertion member can be inserted with a low insertion force, and the electrode terminal on the insertion member side can be scraped by strong rubbing with the contact material at the time of insertion, or the surface of the electrode terminal can be roughened. There is no. After the insertion of the insertion member, the contact material can be largely displaced by tightening the screw and the nut to make pressure contact with the electrode terminal of the insertion member, and a high load value can be obtained from the contact material. Therefore, high connection stability can be obtained.

Further, the nut inserted into the housing body is held by the protrusion on the cover housing side, or a quadrangular nut is used as the nut, so that the nut is securely held in a rotation-stopped state. As a result, the tightening failure due to the rotation of the nut when the screw is tightened is prevented, the contact material can be tightened sufficiently with the screw after inserting the insertion member, and a large displacement of the contact material can occur. A high connection load value between the member and the contact material can be stably obtained.

For this reason, it becomes possible to use it in a higher temperature environment, and it becomes possible to stably supply a larger current to the heating heater, and in the heating device as the image fixing device, the fixing speed is increased. It is possible to increase the fixing size.

[0043]

EXAMPLE In this example, as in the above-described example (FIGS. 21 to 24), in the film heating type heating apparatus A, the connector 11 for supplying power to the heater 1 as the heating means and the connection structure. The same components and parts as those of the above-mentioned example are designated by the same reference numerals, and the description thereof will be omitted.

FIG. 1 shows the power supply connectors 11 and 11 at both ends.
2 is a perspective view of both ends of the heater 1 in which the power supply connectors 11 and 11 are attached to both ends.

The power supply connectors 11 and 11 mounted on both ends of the heater both have the same structure. As shown in the exploded plan view of FIG. 3, a housing body (connector housing) 12 and an insertion arrangement inside the housing body 12 are arranged. A contact material 13, a hexagonal nut 14 that is also inserted and arranged in the housing body 12, a cover housing 15 that seals a contact material / nut insertion opening on the back side of the housing body 12, and a nut 14.
It consists of 5 parts, a screw 16 (Figs. 1 and 7) that is screwed into.

(1) Housing body 11 FIG. 4A is a plan view of the housing body 11, and FIG.
Is a rear view, and (c) and (d) are a left side view and a right side view, respectively.

The housing body 11 is formed of an insulating material, generally a resin such as nylon, PBT, PET or the like.

On the front side, the heater 1 as an insertion member
And an opening 12a into which the end of the heater holder 7 is inserted.

On the back side, an opening 12b for inserting the contact material 13 and an opening 12 for inserting the hexagon nut 14 are formed.
have c.

A screw insertion hole 12d for inserting the screw 16 is provided on the upper surface side.

In the housing body 12, a contact material storage portion 12e and a nut storage portion (nut guide portion) 1 are provided.
Has 2f. The nut storage portion 12f has a structure for holding one opposite side of the hexagon nut 14 and a part of the bottom surface.

Further, a wire case portion 12g is provided on the back side of the housing body 11 in a direction perpendicular to the insertion direction of the contact material 13.

(2) Contact Material 13 FIG. 5A is a plan view of the contact material 13, FIG. 5B is a front view, and FIG. 5C is a left side view.

The contact material 13 is a sheet metal processed product of a plate material made of a conductive metal and having a spring property, and the connector 11
A structure in which at least the electrode terminal 4 surface of the end portion of the heater 1 and the heater holder 7 inserted into the connector 11 and the side surface in contact with the side surface and the back surface in contact with the side surface are surrounded by a continuous body, that is, the insertion member. It has a structure in which the peripheral surface of the insertion portion of 1 · 7 is surrounded by a continuous body, and one side surface thereof is open.

From the open portion, a pair of tightening collar seats (tabs) 13a are respectively directed outward.
13a, and the screwing holes 13b and 13b are formed in the tightening collar seats 13a and 13a.

The contact material portion of the heater 1 facing the electrode terminal 4 has a V-shape, and this shape is used to obtain spring characteristics when the insertion member 1 and 7 are connected. That is, the V-shaped downward vertex 13e of the contact material 12
Is a contact material 1 for the electrode terminal portion 4 of the heater 1.
It becomes an electrical connection part on the second side.

Further, on the trailing edge side of the contact material 13, there are provided an insulation barrel portion 13c and a wire barrel portion 13d for connecting the feeding wire W.

(3) Cover housing 15 FIG. 6A is an external view of the cover housing 15, and FIG.
Is a right side view, (c) is an inside view, and (d) is a plan view.

Like the housing body 12, the cover housing 15 is made of an insulating material, generally nylon, PBT, or the like.
The plate member is made of a resin such as PET and has an outer shape that is substantially the same as the outer shape of the back surface of the housing body 12. On the inner surface side thereof, a projection 15a for holding a nut that is fitted into the nut storage portion 12f from the nut insertion opening 12c of the housing body 12 is provided.

(4) Assembly of Connector 11 The connector 11 is assembled as follows.

From the nut insertion opening 12c on the back surface of the housing body 12, the nut 14 is inserted into the nut accommodating portion 12f in the housing body 12 and pushed sufficiently until it is received in the depth of the nut accommodating portion. By fully pushing in, the female screw hole of the nut 14 is positioned corresponding to the screw insertion hole 12d on the housing body 12 side.

Next, the contact material 12 is inserted from the contact material insertion opening 12a and pushed in sufficiently until it is received. This contact material 1 by pressing it in sufficiently
The part of the tightening collar seats 13a, 13a of 2 is located above the nut 14 and is fitted into the female screw hole of the nut 14 in the collar seat 1.
The screw insertion holes 13b and 13b of 3a and 13a are located at corresponding positions. When a predetermined amount of the contact material is inserted into the contact material housing 12e from the contact material insertion opening 12b of the housing body 12, the contact material 13 interferes with the housing body 12 and prevents further insertion, Further, a cut-and-raised portion is provided to prevent the insertion contact material from coming off by interfering with the housing body 12.

The feed wire W is connected to the insulation barrel portion 13c and the wire barrel portion 13d of the contact material 12, the wire connecting portion is bent 90 degrees with respect to the contact material 12, and the wire base portion is the wire case of the housing body 12. Part 12g is accommodated.

Next, the back side of the housing body 12 on the side of the contact material / nut insertion openings 12b and 12c is sealed with the cover housing 15. In the present embodiment, the sealing of the cover housing 15 with respect to the housing body 12 is provided with locking claws 12h at the main parts of the housing body 12, and those claws 12 are provided on the cover housing 15 side.
It is provided with a locking hole portion 15b which fits and engages with h.
It is performed by fitting and engaging 2h and 15b.

The order of inserting the nut 14 and the contact material 13 into the housing body 12 may be reversed. The procedure may be such that the wire W is connected to the contact material 13 and then the contact material 13 is inserted into the housing body 12. The cover housing 15 may be attached to the housing body 12 by using other attaching means such as a screw or an adhesive.

(5) Coupling of connector 11 and insertion members 1 and 7 In the assembled connector 11 described above, the screw 16 is inserted into the screw insertion hole 12d of the housing body 12 to tighten the contact member 13 in the housing body 12. Seat 13a
-Nut 1 through the screw insertion holes 13b and 13b of 13a
Before being screwed into 4 and tightened, the contact material 13 is in a state where one side surface is open as shown in FIGS. 7 and 8.

In this state, the connector 11
The ends of the heater 1 and the heater holder 7, which are insertion members, are inserted through the insertion member insertion opening 12a on the front side of the. FIG. 9 shows this state.

Since one side surface of the contact material 13 in the connector 11 is open during this insertion, the upper side of the contact material 13 can escape upward, and therefore, a low insertion force and a surface of the electrode terminal portion 4 can be removed. Damageless is possible.

Then, by tightening the screw 16 into the nut 14, the tightening collar seats 13a, 13a of the contact member 13 which are open to each other as shown in FIG. The contact member 12 which is closed and tightened as shown in FIG. 11 and which is an electrical connection part of the contact member 13 with the insertion members 1 and 7, that is, an electric connection part on the contact member 12 side to the electrode terminal portion 4 of the heater 1. It is possible to give a large amount of displacement to the V-shaped downward vertex 13e. FIG. 12 is a schematic vertical sectional view of the contact material storage portion in this connected state.

That is, the contact material 12 of the connector 11
Has a structure in which the portion of the end of the heater 1 and the heater holder 7 which is an insertion member facing the electrode terminal 4 on the heater 1 surface is V-shaped, and the insertion members 1 and 7 are surrounded by a U-shape. When the insertion members 1 and 7 are inserted, the screw 16 is not screwed into the nut 14 or the screw 16 is loosened so that the U-shaped configuration allows the screw 16 to be released (FIGS. 7 and 8). By tightening the screw 16 after insertion, the released portions 13a and 13a are connected (see FIGS. 10 and 1).
1), it has a cylindrical shape surrounding the insertion members 1 and 7.

At this time, a load is applied to the electrode terminal 4 by the amount of displacement of the downward V-shaped apex 13e of the contact material 12, which is an electrical connection portion on the contact material 12 side with respect to the electrode terminal portion 4 of the heater 1.

With such a structure, the electrode terminal 4 can be inserted with a low insertion force during insertion (FIG. 9), and the electrode terminal 4 is not scraped during insertion or the surface of the electrode terminal 4 is not roughened. Then, after insertion, a large amount of displacement is obtained by tightening with screws (FIG. 10), so that a high load value can be obtained from the contact material 13. Therefore, high connection stability can be obtained.

(6) Positioning and holding of the nut 14 The nut 14 must be in close contact with the contact material 13 in order to ensure the displacement of the contact material 13 when tightening the screw. Also, when tightening the nut 14
If the contact material 13 and the contact material 13 are not in close contact with each other and are not integrated, tightening of the screw 16 may become unstable, the screw 16 may loosen, the displacement of the contact material 13 may decrease, and the load may decrease.

Therefore, when the housing body 12 and the nut 14 such as the insertion mold are integrated, the brim portions 13a and 13 of the contact member 13 are formed.
The height of “a” and the height of the integrated nut surface do not match due to variations in tolerance, and thus the nut surfaces do not come into close contact. Therefore, the housing body 12 and the nut 14 cannot be completely integrated.

In this case, the housing body 12 must hold the side surface of the nut so that the nut 14 does not rotate when tightening the screw, but as shown in FIG. 14, the inner wall of the nut accommodating portion 12f of the housing body 12 is fixed to the nut. 14 has a chevron shape matching the side surface shape, and the nut insertion opening 12c
In the case where the nut 14 is held by inserting the nut 14 from the tongue until it is received, the nut 14 is held by the housing body 12 on only one opposite side, and the housing body is made of nylon. Since it is made of resin such as PBT / PET, the nut holding surface of the housing body 12 is deformed by the screw tightening torque and the nut 14 rotates, so that the contact material 13 cannot be tightened. Therefore, contact material 1
There was a problem in that a large amount of displacement could not be applied to No. 3.

Therefore, in this embodiment, as described above, the inner surface side of the cover housing 15 is provided with the projection 15a for holding at least one side surface of the nut 14 inserted into the nut housing portion 12f of the housing body 12.

That is, after inserting the nut 14 and the contact member 13 into the housing body 12, the cover housing 1 is attached to the rear surface of the housing body 12.
5, the nut holding protrusion 15a on the inner surface side is attached and sealed while the nut holding projection 12a is fitted into the nut receiving portion 12f from the nut insertion opening 12c, and as shown in FIG. Hexagon nut 14 inserted in nut storage part (nut guide part) 12f of 12
Is brought into a state in which the three opposite sides are held by the tips of the protrusions 15a facing each other.

Therefore, as compared with the case of holding only one opposite side as in the structure example of FIG. 14, the force applied to the nut holding portion of the housing body 12 is dispersed. Therefore, the nut holding portion of the housing body 12 does not deform, and the nut 14 does not rotate when the screw 16 is tightened.

Further, as shown in FIGS. 8, 11, and 13, the hexagon nut 14 is pressed from the rear of the housing body 12 by the nut holding projection 15a of the cover housing 15. Therefore, the hexagonal nut 14 prevents the nut from moving backward (indicated by a chain double-dashed line) due to the rotation of the hexagonal nut 14 that occurs in the structure example of FIG. 14, and prevents the nut 14 from rotating when the screw 16 is tightened. Disappears.

As described above, by providing the projection 15a for holding the nut on the cover housing 15, it is possible to disperse the force applied to the housing and prevent the escape due to the rotation of the nut. After inserting the holder for holding the substrate and the heater substrate, the contact material 13 can be stably tightened with the screw 16. Therefore, a load that can withstand creep under a high temperature environment can be generated, and the reliability of connection can be improved.

In the example of FIGS. 15 and 16, the nut to be inserted into the nut housing portion 12f of the housing body 12 is a quadrangular nut 14A.

In this example, since the nut has a square shape, the area for holding the nut can be increased, and the distance R to the action point (nut end) of the torque applied to the housing body 12 at the time of tightening is Hex nut 1
4 (FIG. 14), it can be made longer. Therefore, the force applied to the action point is small even if the tightening torque value is the same. Therefore, the deformation of the housing body 12 does not occur.

Further, by making the lengths A and B of the opposite sides of the quadrangular nut 14A different, it is possible to increase the amount of deformation of the housing body 12 required when the nut rotates. That is, A <B as shown in FIG.
In the case of the quadrangular nut 14A, the two nut holding surfaces of the housing body are respectively SQR when rotating.
((A / 2) ² + (B / 2) ² ) −A / 2 or more must be deformed. If the deformation of the housing body 12 is smaller than this, the nut 14A cannot rotate.

As shown in FIGS. 15 and 16, by making the nut to be inserted into the housing body 12 into a quadrangular shape, the force applied to the housing body at the time of tightening is reduced to prevent deformation, and at the same time, the housing required for rotation is required. It is possible to prevent rotation by increasing the deformation amount. Therefore, a large displacement can be generated in the contact material 13 without rotating the nut during tightening, and high connection reliability can be obtained in a high temperature environment.

As in the case of using the hexagonal nut 14 in the above-mentioned example, the case of using the quadrangular nut 14A in this example is also shown in FIG.
As described above, by providing the protrusion 15a ′ for holding the side surface of the square nut 14A on the inner surface side of the cover housing 15, the nut rotation preventing effect can be further enhanced, and the backward displacement of the nut 14A can be prevented. It is self-explanatory. As shown in FIG. 18, the length B of the square nut 14A in the insertion direction with respect to the housing body 12 is set to the nut housing portion 12.
The same effect can be obtained by making the length of f substantially equal to the nut insertion direction.

As described above, the cover housing 15 for sealing the housing body 12 is provided with the protrusion 15a for holding the side surface of the nut, and the square nut 14 is provided.
By using A, it becomes possible to tighten the contact material 13 with the screw 16 after the insertion,
It is possible to generate a large displacement after insertion into the, and obtain a high connection load value. Therefore, it can be used in a higher temperature environment, a larger current can be stably supplied to the heater, and the fixing speed can be increased and the fixing size can be increased.

(7) Reduction of bending stress applied to the insert member The electrode material 4 of the insert members 1 and 7 is reduced by the contact material 13.
The load applied to is obtained by the insertion members 1 and 7 not displacing (moving) with respect to the load. That is, the insertion members 1 and 7 receive a reaction force against the load applied to the electrode terminal portion 4 on the back surface side thereof.

When the contact material 13 is a continuous body and is also in contact with the back surface of the insertion member, the contact material generating a load on the electrode terminal portion 4 has its force balanced so that the forces are balanced. The reaction force of the load value is applied to the insertion member. Therefore, the connector 11 used in a high temperature environment
Has a structure in which a high reaction force is applied to the back surface of the insertion member in order to obtain a high load value on the connecting portion 13e.

For example, in an extreme case, the connecting portion 13e
When the back surface area of the insertion member directly below the connector is not in contact with the connector (floating), two forces (load of the electrode terminal portion 4 and reaction force of the back surface) acting on the insertion member 1 and 7 are applied. The lines of force are not collinear but have a certain spacing. Therefore, a moment is generated, and bending stress acts on the insertion members 1 and 7.

For example, when the ceramic substrate is an insertion member, the bending strength is 2500 Kgf / mm ² , when the ceramic substrate (92% alumina) is compared with the compressive stress in the case where the portion directly below the connecting portion is in contact. Strength is 20000
Since it is different from Kgf / mm ² by one digit, the insertion member (ceramic substrate) may be destroyed depending on the contact state of the back surface. Therefore, it is necessary to deal with the reaction force applied to the insertion member.

Even when the entire back surface is in contact, for example, in the connector shown in FIG.
7, when the screw 16 is fastened and the screw 16 is tightened, the reaction force F ′ of the load F due to the V-shaped deformation of the upper portion of the contact material 13,
F ″ acts on both sides of the contact material and on the back surface of the insertion member. The point of action thereof is concentrated on the contact portion between the heater holder 7 and the contact material 13 closest to the side surface of the contact material 13. That is, the heater holder 7 It acts upward on the edge of the heater holder and lifts the back surface of the heater holder 7.

Therefore, as the load applied to the insertion members 1 and 7, the downward load of the central portion and the upward load of both ends are applied. The way of applying such load is three-point bending,
Very high stress is applied to the central electrode terminal portion or the tab 13a, and in the worst case, the electrode terminal 4, the ceramic substrate 2 or the tab 13a is destroyed.

Furthermore, when the insertion members 1 and 7 are deformed by bending stress, a lateral force component acts on the load,
There is a possibility that a slight external force will be applied and the contact portion 13e will slide in time and the contact state will become unstable.

Therefore, in the case of the connector 11 of this embodiment, as shown in FIG. 5, FIG. 7, FIG. 9, FIG. 10, and FIG. 12, the V contacting the contact member 13 with the electrode terminal 4 of the insertion members 1 and 7 is performed. A protrusion 13f is provided at a portion facing the downward end portion (electrical connection portion) 13e of the letter shape.

The shape of the protrusion 13f varies depending on the processing tolerance of the contact material 13, and the contact when the insertion members 1 and 7 are fitted and the screws 16 are tightened (at the time of connection) as shown in FIGS. In consideration of the deformation of the material 13, the electrical connection portion 13e is located at the center of the protrusion 13f, and has a wide rectangular shape (width e in FIG. 10) on both sides of the protrusion 13f to provide a positional deviation margin at the time of connection. is there. At this time, making the width of expansion as small as possible means making the span distance of bending stress small as described later.

As shown in FIGS. 10 and 12, the insertion members 1 and 7 are fitted to the contact material 13 of the connector 11 and the screws 16 are attached.
In the state in which is fastened, the electrical connection portion 13e is connected to the load F generated by the V-shaped displacement of the contact material 13.
Is pressed against the electrode terminal 4 of the heater 1 and electrically connected. At this time, the contact material 13 generates a downward force at the V-shaped tip portion 13e, and at the same time, F'and F "(-F = F '+) at both ends of the V-shaped portion.
F ") is generated upwards because the forces are balanced and both the connector and the insert are stationary.

The upward forces F'and F "act on the projection 13f which is in contact with the back surface of the insertion member 1.7 through both side surfaces of the contact member 13. In this case, the insertion member 1.7 is The electrode surface and the back surface receive a vertical force within a very narrow width.The bending stress is proportional to the span distance to which the force is applied.In the present embodiment, from the holder width E which is the conventional span width to the protrusion 13f. Since the span width is reduced to the width e of the protrusion 13f, the bending stress can be significantly reduced.

The cross-sectional shape of the protrusion of the protrusion 13f is
If the processing accuracy of the contact material is improved, the span distance to which the force is applied is further reduced, and therefore the shape may be an arc shape or a V shape.

As described above, since the contact member 13 is provided with the protrusion 13f so that the contact member 13 and the insertion members 1 and 7 contact each other just below the load applied to the electrode terminal 4, the contact member 13 is inserted at the time of connection. The vertical force applied to the members 1 and 7 approaches the same line, and it becomes possible to prevent the occurrence of excessive bending stress. Therefore, a stable connection can be obtained even with a heavy load connector.

As shown in FIG. 19, a protrusion 7a having the same function as the protrusion 13f of the contact member 13 may be provided on the back side of the heater holder 7, which is the insertion member 1/7 side. The protrusion 7a is formed by the contact material 1
It is provided directly below the region where the electrical connection portion 13e of 3 and the electrode terminal 4 are connected.

The shape of the projecting portion 7a is a rectangular shape in consideration of the shift of the connecting portion due to the fitting tolerance at the time of inserting the contact member 13 and the inserting members 1 and 7.

The insertion members 1 and 7 are connected to the connector 1
In the state where the contact member 13 is fitted to the contact member 13 and the screw 16 is tightened, the reaction forces F ′ and F ″ of the contact member 4 are the protrusions 7 a on the back surface of the heater holder 2 and the contact member 13.
Over the contact area of.

Therefore, as in the case where the projection 13f is provided on the contact material 13 side as shown in FIGS. 10 and 12, it is possible to prevent the occurrence of excessive bending stress and obtain a stable connection. The cross-sectional shape of the protrusion of the protrusion 7a may be arcuate or V-shaped. Furthermore, the protrusions 13f and 7a may be provided on both the contact material 13 and the holder 7.

With the above structure, the contact portion of the contact member and the insertion member, on which the load is applied, has the connection portion with the load electrode in the direction of pressing the contact material against the electrode and the back surface provided on the force line on which the load is applied. There will be two locations on the side convex portion. Therefore, it becomes possible to prevent the occurrence of bending stress. Further, the load area applied to the insertion member is concentrated near the connection portion, and stable connection can be obtained.

That is, the back surface of the insertion member or the contact material that receives the back surface of the insertion member is provided with a protrusion so that the force line of the load applied to the electrode portion is at the center, and the back surface of the insertion member and the contact material. By adopting a connection structure in which the connection is made with this protrusion, bending stress applied to the insertion member at the time of connection can be reduced, a high connection load can be applied, and connection failure due to creep under high temperature environment can be prevented. It becomes possible to solve it. Therefore, a large current can be supplied, a heater with a large output can be supplied, and the fixing speed in the image forming apparatus can be increased and the fixing size can be increased.

[0106]

As described above, according to the connector of the present invention, the insertion member can be inserted with a low insertion force because the contact member is in the released state, and the electrode member on the insertion member side can be inserted into the contact member. It does not scrape off due to strong rubbing with or roughen the electrode terminal surface. After the insertion of the insertion member, the contact material can be largely displaced by tightening the screw and the nut to make pressure contact with the electrode terminal of the insertion member, and a high load value can be obtained from the contact material. Therefore, high connection stability can be obtained.

Further, the nut inserted into the housing body is held by the protrusion on the cover housing side, or is held in a state where rotation is firmly stopped by using a quadrangular nut as the nut. As a result, the tightening failure due to the rotation of the nut when the screw is tightened is prevented, the contact material can be tightened sufficiently with the screw after inserting the insertion member, and a large displacement can be generated in the contact material. A high connection load value between the member and the contact material can be stably obtained.

Therefore, it can be used in a higher temperature environment, a larger current can be stably supplied to the heating heater, and the fixing speed can be increased in the heating device as the image fixing device. It is possible to increase the fixing size.

[Brief description of drawings]

FIG. 1 is a schematic plan view and a conduction circuit diagram of a heater equipped with a power supply connector as a first embodiment, with some cutouts and intermediate portions omitted

FIG. 2 is a perspective view of both ends of the heater in which a power supply connector is attached to both ends.

[Figure 3] Exploded plan view of the power supply connector

FIG. 4A is a plan view of a housing body, and FIG.
Is a rear view, and (c) and (d) are a left side view and a right side view, respectively.

5A is a plan view of a contact material, FIG. 5B is a front view, and FIG. 5C is a left side view.

6A is an external view of a cover housing, FIG.
Is a right side view, (c) is an inside view, (d) is a plan view

FIG. 7 is a schematic diagram showing the state before the contact material is tightened (in the released state).

FIG. 8 is a schematic cross-sectional view of the hexagon nut storage portion in the same state.

9 is a schematic view showing a state in which an insertion member is inserted in the state of FIG. 7.

FIG. 10 is a schematic diagram showing a state in which a contact material and an insertion member are connected by tightening a screw.

FIG. 11 is a schematic cross-sectional view of the hexagon nut storage portion in the same state.

FIG. 12 is a schematic vertical sectional view of the contact material storage portion in the same state.

FIG. 13 is a schematic diagram showing a state where the hexagon nut is held by a protrusion on the cover housing side.

FIG. 14 is a schematic diagram for explaining rotation and backward movement of the hexagon nut when there is no holding protrusion.

FIG. 15 is an exploded plan view of a power supply connector in which a nut is a square nut.

FIG. 16 is a schematic vertical cross-sectional plan view of a nut storage portion in which a square nut is stored.

FIG. 17 is a schematic vertical cross-sectional plan view of a nut storage portion of an example in which a nut holding protrusion is provided on the cover housing side.

FIG. 18 is a schematic vertical cross-sectional plan view of a nut storage portion of another example.

FIG. 19 is a schematic view showing an example in which a bending stress applied to the insertion member is reduced by providing a protrusion on the back surface of the heater, which is the insertion member, on the end side of the heater holder.

FIG. 20 is an explanatory diagram of bending stress acting on the insertion member.

FIG. 21 is a schematic cross-sectional view of a main part of a film heating type heating device.

FIG. 22 is a schematic plan view and a conduction circuit diagram of a heater in which a power supply connector is fitted to both ends as a conventional example, in which a part of the heater is partially cut away and the middle part is omitted.

FIG. 23 is a perspective view of both ends of the heater fitted with a power supply connector.

FIG. 24 is a schematic vertical sectional side view of one of the power supply connector portions.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 heater 7 heater holder 11 connector 12 housing body 13 contact material 13e electrical connection portion with the electrode terminal 4 on the insertion member side 13f protrusions provided on the contact material 14 ・ 14A hexagon nut or quadrangular nut 15 cover housing 15a ・15a 'Projection for retaining nut 16 Screw

Claims (4)

[Claims] 1. A nut and a contact material made of a conductive material and having a spring structure are mounted on a housing body made of an insulating material, and after mounting, the housing body is provided at a part of the housing body where the nut and the contact material are inserted. And a structure in which a cover housing made of an insulative material, which is separate from, is attached, and after inserting the insertion member into the contact material, tighten the contact material with the screw and the nut to connect the contact material and the insertion member. A connector having a protrusion that holds at least one side surface of a nut inserted into the housing body is provided in a cover housing attached to the body housing. 2. The connector according to claim 1, wherein the nut is a hexagon nut. 3. A nut and a contact material made of a conductive material and having a spring structure are mounted on a housing body made of an insulating material, and after inserting the insertion member into the contact material, the contact material is fixed by a screw and the nut. A connector having a structure in which a contact material and an insertion member are connected by tightening, and the nut inserted into the housing is a quadrangular shape. 4. A cover housing, which is attached to a part of a housing body into which a nut and a contact material are inserted, is made of an insulating material, which is separate from the housing body, and the cover housing is inserted into the housing body. The connector according to claim 3, further comprising a protrusion that holds a rear end of the rectangular nut.